Using Image Calibration Techniques to Reduce Noise in Digital Images

This is interesting, especially after reading the TNG article on astronomy this morning where these ideas are used, it’s great to see it described in such detail! Basically, noise in digital cameras isn’t as random as may it may seem, and if you have a calibration image with that noise intact, you can subtract the noise from any photo.
This tutorial explains all that in more detail and could be very useful for cameras that take RAW images, but I verified that jpeg files can’t be manipulated so successfully unfortunately!

No JPEG image can have its noise reduced by the calibration steps described here – the data is too drastically altered by compression to allow dark or bias subtraction to work right.

Delicious Photography Links

Via Thunderbird’s RSS reader…

Too much of a good thing?

Too much of a good thing?

Back in the day, I’d get a CD and I’d listen to it. A lot. A CD was a considered purchase – if I was going to make the effort to go to the store and spend my hard earned money on it, it was going to be worth it. In the car, at the gym, at work, at home – I’d listen to it everywhere. The first few listens usually couldn’t be at work, because I’d be listening. Once my brain knew the album, then it could become soundtrack to whatever else I was working on.

I get that feeling all the time these days, although when I look over photographs I took only a few weeks ago I’m quite often pleasantly surprised at how fresh they are!

Workflow: Filing and Finding Your Images

Right, a quick check shows I have some 24GB of photos. That’s a lot considering they’re all jpg files and not huge raw images!
Anyway, I have my own system for archiving at home but it’ll probably need to be reworked – I’ve another 250MB of photos to copy over from my camera yet no space left! I think a combination of storing original images on DVD, and smaller images on my PC for easy browsing will be most useful.
For more ideas, About.com published this good article describing ways to sort and archive your photos. His point about re-reading 2 year old media is good, and hopefully in 2 years time, larger capacity DVDs will be widely available! 🙂